Relation Between Global Warming And Tropical Storm

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it was presented by my friend Mr. Saumik Samanta in may,2009

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Relation Between Global Warming And Tropical Storm

  1. 2. <ul><li>Thunderstorm categorized by cyclonic wind activity developed in Low Pressure region of Tropics. </li></ul><ul><li>Wind speed belonging to 63-112 km/h. </li></ul><ul><li>Controls the Global Atmospheric Circulation Mechanism in Troposphere </li></ul><ul><li>Ex. Hurricane,Typhon,Katrina,Rita, Includes tropical depressions, tropical storms </li></ul><ul><li>Tropical Cyclone occur when Sea Surface Temperature ( SST )>26 0 C </li></ul><ul><li>TROPICS </li></ul><ul><li>Located 23½° N to 23½° S. </li></ul><ul><li>Large amount of solar radiation. </li></ul><ul><li>Little seasonal variation. </li></ul><ul><li>Warm water is the source of tremendous </li></ul><ul><li>latent heat source. </li></ul><ul><li>High relative humidity promotes cumulus cloud development. </li></ul><ul><li>Surface winds from the east </li></ul>TROPICS
  2. 3. <ul><li>Sun generated tremendous heat increase the percentage of Moisture in air of Sea. </li></ul><ul><li>Higher wind speed and create a Low Pressure zone . </li></ul><ul><li>More Condensation of moisture in air. </li></ul><ul><li>Enthalpy of condensed moisture generate power in Warm core . </li></ul><ul><li>Convective available Potential Energy is effected by large scale subsiding air. </li></ul><ul><li>Starting of Cyclonic wind rotation depending upon the rotation of earth. </li></ul><ul><li># Anticlockwise rotation in Northern Hemisphere. </li></ul><ul><li># Clockwise rotation in southern Hemisphere. </li></ul><ul><li>fig :1 </li></ul><ul><li>Pressure gradiant force is represented by Blue Arrows. </li></ul><ul><li>Coriolis force is repreasented by Red Arrows. </li></ul>
  3. 4. <ul><li>Huge amount of greenhouse gas create a cover over the atmosphere. </li></ul><ul><li>Sun generated heat can’t reflect to space. </li></ul><ul><li>Hotter atmosphere, higher SST. </li></ul><ul><li>Last 35 yr ,Global SST jump .5 0 C </li></ul><ul><li>Fig2: Global Mean Surface temp. Anomalies Fig3: Sea Surface Temp Anomalies </li></ul>
  4. 5. <ul><li>Atmospheric water vapour pressure increases ,specially at tropical regain by increasing SST. </li></ul><ul><li>water vapour increase 1.3% per decades. </li></ul><ul><li>Surface pressure falls </li></ul><ul><li>Enhancing tropical convection </li></ul><ul><li>More power generate by huge enthalpy of condensed moisture. </li></ul><ul><li>Tropical storm intensity and frequency increase. </li></ul><ul><li>Fig4: </li></ul><ul><li>The Low Pressure zone </li></ul><ul><li>occurs at higher SST </li></ul>
  5. 6. <ul><li>Due to SST increase, wind speed also change in upward dip in fig 5 and cyclone intensity increase. </li></ul><ul><li>Fig5:Atlantic Tropical </li></ul><ul><li>Cyclone intensity vs SST </li></ul><ul><li>Fig 6: Global Hurricane intensity change Fig 7:Regional hurricane intensity change </li></ul>
  6. 7. YEAR AVG. STORM AVG. HURRICANE AVG.DEVASTATIVE HURRICANE 1970-2004 8.6 5 1.5 1995-2004 13.6 7.8 8.6

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